The Mesozoic is the geological era from about 251.902 to 66.00 million years ago. It contains the Triassic, Jurassic and Cretaceous periods and precedes the Cenozoic. The chart gives uncertainty on the older numerical boundary.[ref]
International Chronostratigraphic Chart by International Commission on Stratigraphy (2026-06). Cenozoic and Mesozoic columns; numerical ages in Ma
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